condition mean min max ZT0-3 27.078575 23.6993 30.45785 ZT4-7 47.5522 47.5522 47.5522 ZT8-11 90.19749999999999 90.19749999999999 90.19749999999999 ZT12-15 0 0 0 ZT16-19 125.277 125.277 125.277 ZT20-23 77.7598 77.7598 77.7598